Side moon
A side moon is a halo phenomenon that is caused by the refraction of moonlight on ice crystals in the troposphere .
Analogous to the sub-suns , the phenomenon occurs at a distance of around 22 ° on both sides of the moon, and usually only when covered with cirrus or cirrostratus clouds , but can in principle also be caused by ice crystals at a low altitude (e.g. polar snow ) become. Sub-moons are rarer than sub-suns, as the moon has a lower luminous intensity than the sun. They are therefore usually only visible when the moon is full.
See also: side sun